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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2016  >  38(5): 635-640
Huang Juan, Ye Deliao, Han Yu. Petoleum geology features and accumulation controls for ultra-deep oil and gas reservoirs[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(5): 635-640. doi: 10.11781/sysydz201605635
Citation: Huang Juan, Ye Deliao, Han Yu. Petoleum geology features and accumulation controls for ultra-deep oil and gas reservoirs[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(5): 635-640. doi: 10.11781/sysydz201605635
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Petoleum geology features and accumulation controls for ultra-deep oil and gas reservoirs

doi: 10.11781/sysydz201605635

  • Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

  • Received Date: 2015-08-31
  • Rev Recd Date: 2016-08-05
  • Publish Date: 2016-09-28
    Abstract
  • According to previous studies and specific geological settings of different regions, ultra-deep reservoirs have been defined as being 6 km. Petroleum geology studies of ultra-deep reservoirs have been made, including considerations of source rock, reservoir, cap rock and trap. Compared to conventional source rocks, the source rocks in ultra-deep reservoirs entered the mature stage later and have a higher maturity. Hydrocarbon generation was controlled by temperature, time and pressure. Overpressure strongly restricted the thermal evolution of orga-nic matter and hydrocarbon generation. Secondary pores with an older age worked as the main reservoir space. Carbonate rocks account for 33% of reservoir. Cap rocks are dominated by evaporites and mudrocks. The major traps are structural, lithological, reef and combination traps. The formation of ultra-deep reservoirs was controlled by abnormal pressure and temperature. It is suggested that ultra-deep oil and gas exploration in China should focus on the areas with lower geothermal gradients, stratigraphic intervals with secondary porosity and well-developed overpressures, deeply-buried carbonate rocks, sub-salt sequences and East China's deep offshore areas.

     

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